DC's "Legends of Tomorrow" is busy filling out its roster for the highly anticipated winter debut on the CW, adding new villains to the cast. The newest of which is "Mr. Robot" actress Stephanie Corneliussen.

The Wrap reports that Corneliussen has been cast in a recurring role for the freshman season of the "Arrow/The Flash" spinoff series. Her character name will be Valentina Vostok, and she will be taking part in a storyline that has a multi-episode arc for the series. There has been no word yet if she will only be appearing on "Legends" or if she will also be making some crossovers on "Arrow" or "The Flash" in this dynamic DC TV universe.

Her character is initially a suspected liability for superheroes The Atom (Brandon Routh) and Captain Cold (Wentworth Miller). It is their suspicion she is working with the main big-bad for the series, which is Vandal Savage (Casper Crump).

Although it will take some time to discover her true motives on the show, the two superheroes will initially compete for her affections in order to get a better read on her true intentions.

There has been no word yet on how may episodes she is scheduled to appear in, but it seems as though she may be vying for a main cast role, currently only listed as recurring for the season.

The show is set to star Miller, Routh, Dominic Purcell, Arthur Darvill, Caity Lotz and Victor Garber in major starring roles for the series.

Fans may know Corneliussen for her breakout role on "Mr. Robot" this summer, which many considered to be the summer's best show. Her other acting credits include "The Exes," "Bad Judge" and "Hansel & Gretel: Witch Hunters." Her IMDb resume currently only dates back to 2013. She has also been listed as appearing on the first five episodes of "Legends" this winter.